Unfortunately, Mac and some old computers can only detect a bootable USB drive formatted to FAT32 during starup in BIOS.įrom above screenshot, you can see install.wim file is bigger than 4GB from unpacked folder of Windows 10 ISO image file. This is one of the biggest pitfalls of FAT32 file system.
The reason is that FAT32 partition is unable to store a single file larger than 4GB. The increasement in file size brings up a new issue when creating bootable USB from Windows 10 ISO, especially on Mac. Now, the size of Windows 10 ISO goes from 3.8 GB (1507) to 4.6 GB (1909). By Petty Madison | Last Updated: Feb.4, 2021Ī lot of new features were added to Windows 10 by Microsoft team in recent years.
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